Honda EU20i Owner's Manual page 19

Loosen the cover screw and remove the left side maintenance cover.
Remove the oil filler cap, and wipe the dipstick with a clean rag. Check
the oil level by inserting the dipstick in the filler hole without screwing
it in.
If the oil level is below the end of the dipstick, refill with recommended
oil up to the top of the oil filler neck.
Running the engine with insufficient oil can cause serious engine
damage.
MAINTENANCE COVER SCREW
OIL FILLER CAP
UPPER LEVEL
MAINTENANCE COVER
DIPSTICK
OIL FILLER HOLE
The Oil Alert System will automatically stop the engine before the oil
level falls below the safe limit. However, to avoid the inconvenience of
an unexpected shutdown, it is still advisable to visually inspect the oil
level regularly.
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